Air carrier descended below assigned crossing restriction.

Attributes
ACN	128732
Time
Date	198911
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : oak
State Reference	CA
Altitude	msl bound lower : 1350 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : oak tower : hwd
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	landing other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 140 flight time total : 8462 flight time type : 6200
ASRS Report	128732
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Bay approach cleared us for a visibility to runway 29 at oak, cross hwd or the 6 DME at or above 2000'. In the several mins prior, bay approach pointed out several targets--one was an small aircraft climbing across our path at the san mateo bridge, another was being vectored toward oak and one in the hwd traffic pattern at 800'. It was a nice, clear evening for flying, and there were many targets in the area. After landing at oak, I was told the hwd tower supervisor wanted to talk to me. He said we were 1350' over hwd. The first officer was flying and staying on or above the G/D, and noticed we were 1900' passing hwd. Until we passed hwd, I was concerned with the traffic outside and we may have inadvertently been too low. The G/south altitude over hwd is about 1600'. Crossing there at 2000' makes a steeper than normal approach. Also runway 28 was shorter than normal due to the fact that the west 3500' was closed. If the 2000' over hwd is going to be the normal proximity, it should be published.

Original NASA ASRS Text

Title: ACR DESCENDED BELOW ASSIGNED CROSSING RESTRICTION.

Narrative: BAY APCH CLRED US FOR A VIS TO RWY 29 AT OAK, CROSS HWD OR THE 6 DME AT OR ABOVE 2000'. IN THE SEVERAL MINS PRIOR, BAY APCH POINTED OUT SEVERAL TARGETS--ONE WAS AN SMA CLBING ACROSS OUR PATH AT THE SAN MATEO BRIDGE, ANOTHER WAS BEING VECTORED TOWARD OAK AND ONE IN THE HWD TFC PATTERN AT 800'. IT WAS A NICE, CLR EVENING FOR FLYING, AND THERE WERE MANY TARGETS IN THE AREA. AFTER LNDG AT OAK, I WAS TOLD THE HWD TWR SUPVR WANTED TO TALK TO ME. HE SAID WE WERE 1350' OVER HWD. THE F/O WAS FLYING AND STAYING ON OR ABOVE THE G/D, AND NOTICED WE WERE 1900' PASSING HWD. UNTIL WE PASSED HWD, I WAS CONCERNED WITH THE TFC OUTSIDE AND WE MAY HAVE INADVERTENTLY BEEN TOO LOW. THE G/S ALT OVER HWD IS ABOUT 1600'. XING THERE AT 2000' MAKES A STEEPER THAN NORMAL APCH. ALSO RWY 28 WAS SHORTER THAN NORMAL DUE TO THE FACT THAT THE W 3500' WAS CLOSED. IF THE 2000' OVER HWD IS GOING TO BE THE NORMAL PROX, IT SHOULD BE PUBLISHED.

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.